R. A. Gushchin, G. I. Gorchakov, A. V. Karpov, O. I. Datsenko
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Vertical Distribution of Saltating Particles in a Windsand Flux
Desertification and aridization of once-fertile areas is one of global environmental problems. To solve this problem, it is necessary to understand the dynamic and electrical processes in a wind-sand flux, which are currently understudied. Regularities in the vertical distribution of saltating particles in a windsand flux are ascertained based on experimental data from a desertified area and a wind channel. The effect of the surface wind speed in the desertified area on this distribution is studied. A piecewise exponential approximation of the vertical profiles of particle concentrations with a wind speed-independent height scale and a logarithmic concentration gradient in the lower saltation layer is suggested. The dependence of the lower saltation layer thickness and the height scale on the saltating particle size (100 to 800 μm) is derived for the mass flux of particles in this layer based on measurements of saltating particle flux profiles in the wind channel. The windsand flux parameters determined from measurements in the desertified area and in the wind channel well agree. Our results can be used for modeling the windsand flux dynamics.
期刊介绍：
Atmospheric and Oceanic Optics is an international peer reviewed journal that presents experimental and theoretical articles relevant to a wide range of problems of atmospheric and oceanic optics, ecology, and climate. The journal coverage includes: scattering and transfer of optical waves, spectroscopy of atmospheric gases, turbulent and nonlinear optical phenomena, adaptive optics, remote (ground-based, airborne, and spaceborne) sensing of the atmosphere and the surface, methods for solving of inverse problems, new equipment for optical investigations, development of computer programs and databases for optical studies. Thematic issues are devoted to the studies of atmospheric ozone, adaptive, nonlinear, and coherent optics, regional climate and environmental monitoring, and other subjects.
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